Sound absorption of porous metals at high sound pressure levels

Wang, Xiaolin; Peng, Feng; Baojun, Chang

doi:10.1121/1.3162828

Cited by 24 publications

(13 citation statements)

References 7 publications

(9 reference statements)

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“…The PFMM is a new type of multifunctional structural material and has demonstrated various novel physical properties, particularly the sound absorption under extreme conditions such as high sound pressure level and high temperature. Due to their excellent sound absorption performance and distinctive heat resistance, lightness, and stiffness, PFMMs are widely used in aircraft engine liners and combustion chambers for the rocket engines [4,5].…”

Section: Introductionmentioning

confidence: 99%

Fractal Model for Acoustic Absorbing of Porous Fibrous Metal Materials

Chen

Wang

et al. 2016

Shock and Vibration

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To investigate the changing rules between sound absorbing performance and geometrical parameters of porous fibrous metal materials (PFMMs), this paper presents a fractal acoustic model by incorporating the static flow resistivity based on Biot-Allard model. Static flow resistivity is essential for an accurate assessment of the acoustic performance of the PFMM. However, it is quite difficult to evaluate the static flow resistivity from the microstructure of the PFMM because of a large number of disordered pores. In order to overcome this difficulty, we firstly established a static flow resistivity formula for the PFMM based on fractal theory. Secondly, a fractal acoustic model was derived on the basis of the static flow resistivity formula. The sound absorption coefficients calculated by the presented acoustic model were validated by the values of Biot-Allard model and experimental data. Finally, the variation of the surface acoustic impedance, the complex wave number, and the sound absorption coefficient with the fractal dimensions were discussed. The research results can reveal the relationship between sound absorption and geometrical parameters and provide a basis for improving the sound absorption capability of the PFMMs.

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Section: Introductionmentioning

confidence: 99%

Fractal Model for Acoustic Absorbing of Porous Fibrous Metal Materials

Chen

Wang

et al. 2016

Shock and Vibration

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“…Wang X.L. reported on a semi-empirical and nonlinear flow resistance model for metal fiber materials [5,6]. This model combined with the acoustic model of Umnova-Attenborough can predict the acoustic performances of the metal fiber porous materials.…”

Section: Progress Of Application Researches Of Sound Absorptionmentioning

confidence: 99%

Progress of Application Researches of Porous Fiber Metals

et al. 2011

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Metal fiber porous materials with intrinsic properties of metal and functional properties of porous materials have received a great deal of attention in the fundamental research and industry applications. With developments of the preparation technologies and industrial requirements, porous fiber metals with excellent properties are developed and applied in many industry areas, e.g., sound absorption, heat transfer, energy absorption and lightweight structures. The applied research progress of the metal fiber porous materials in such application areas based on the recent work in our group was reviewed in this paper.

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“…To achieve a better signal to noise ratio (SNR), the power amplifier gain was adjusted between 90 and 100 dB (25-30 dB more than the background noise level; [42]). Most of the literature suggests that the non-linear response is generally observed beyond $120 dB of sound pressure level (SPL) [43][44][45][46]. Therefore, the excitation levels as used in our impedance tube experiments are well within the linear response.…”

Section: Experimental Setup: Impedance Tube System (Its)mentioning

confidence: 96%